A tool that enables placing and positioning lone control points

The traditional way of drawing a curve in 3d space is by placing a control point and then another, and the second one is instantly connected to the earlier one . But a better method is to place lone and disconnected control points first, and then you could use the curve drawing tool to draw a line over them and connect them into a curve.This is a better method since you could place a control point , change the 3d perspective a little and place another . When you draw a curve or spline over them, it would be more dimensional to begin with and less planer. So I am suggesting a tool next to spline drawing tools, that enable the user to place and position lone control points.